1212023145 has 16 divisors (see below), whose sum is σ = 1958067072. Its totient is φ = 640135680.

The previous prime is 1212023123. The next prime is 1212023173. The reversal of 1212023145 is 5413202121.

It is not a de Polignac number, because 1212023145 - 2⁶ = 1212023081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390696 + ... + 393785.

It is an arithmetic number, because the mean of its divisors is an integer number (122379192).

Almost surely, 2^1212023145 is an apocalyptic number.

1212023145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1212023145 is a deficient number, since it is larger than the sum of its proper divisors (746043927).

1212023145 is a wasteful number, since it uses less digits than its factorization.

1212023145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784592.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1212023145 is about 34814.1227808486. The cubic root of 1212023145 is about 1066.1958090532.

Adding to 1212023145 its reverse (5413202121), we get a palindrome (6625225266).

The spelling of 1212023145 in words is "one billion, two hundred twelve million, twenty-three thousand, one hundred forty-five".